Operation Manual

Menu: Heating circuits
(= 18)
Area within which volumetric
flow must be increased
from NqmodMin to 100 %
den Volumenstrom verstellt
Area of reduced volumetric flow
(= NqmodMin)
100
90
80
Temperature [°C]
70
Required flow temperature
dTkTrNenn
(= 20)
60
at NqmodNenn
50
dTkTrMax
(= 3) 20
Required flow temperautre
40
Theoretical return-
temperature at NqmodNenn
30
measured
temperature at NqmodMin
TiAussenNorm
20
(= -20)
20 15 10 5 0 -5 -10 -15 -20
TkSNorm
(= 70)
Outside temperature [°C]
Modgrad [%] NqmodNenn
100
0
20 10 0 -10 -20
Outside temperature [°C]
NqmodMin
(= 40)
corresponding 100 %
Line no.
Operating line
Diagram
function
Factory setting
886
Standard outside temp
TiAussenNorm
- 15 °C
887
Flow temp setp standard OT
TkSNorm
75 °C
888
Curve readj at 50% speed
dtUeberhBegr
40 %
894
ΔT differential standard OT
dTkTrNenn
20 K
895
dT differential max
dTkTrMax
20 K
Standard outside temp
Standard outside temperature (lowest
outside temperature) at the design
point of a heating system. For standard
outside temperature, max. boiler
setpoint TkS-Norm is assigned.
Maximum supply setpoint at
standard outside temperature
Maximum boiler temperature setpoint
for the heating circuit.
The maximum boiler temperature
setpoint or the standard design
temperature of the heating system
refers to the design point at standard
outside temperature.
Curve correction at 50% speed
This parameter cannot be changed.
ΔT differential standard OT
Heating system spread at standard
outside temperature.
ΔT differential max
Maximum spread between the flow and
return temperature, which is maintained
by the Delta-T controller. This value is
used to control the modulation range of
the pump. If this value is exceeded, the
pump begins to increase its speed.
For Example:
Standard outside temperature for
a certain region according to DIN
e.g.. -15 °C
-> Line 886 to -15°C
A radiator system with 70/50 °C
requires TkSNorm
-> Line 887 to 70 °C
and ΔTkTrNom requires
-> Line 894 to 20 K
A radiator system with 40/30 °C
requires TkSNorm
-> Line 887 to 40 °C
and ΔTkTrNom requires
-> Line 894 to 10 K
30